a good read
http://www.racketboy.com/retro/3do/the-rarest-and-most-valuable-3do-games
Or read about games that are actually fun to play, written by a writer with good taste and something called opinions:
http://www.retro-sanctuary.com/TOP%2040%203do%20GAMES.html
"The Rarest and Most Valuable 3DO Games"
-or how to spend the most money on the fewest games possible."Lucienne’s Quest is the second rarest US release- more copies of it were made for the 3do than Dino Park Tycoon but
unlike DPT the 3DO was the only platform Lucienne’s Quest was released on. Combined with the fact that it is a well regarded RPG, and one of the best games for the 3DO according to those who have been fortunate enough to acquire a copy*, the demand for Lucienne’s Quest usually exceeds any demand for Dino Park Tycoon."
When you're looking for advice on finding most expensive games you can buy, it's best to place all of your faith and subsequently spending cash on recommendations from the real experts who know more about this stuff than anyone.
*I was fortunate enough to acquire Lucienne's Quest by walking into Electronics Boutique with the intent to purchase it. Which I did.